 (defn write-config
   "Write config to a specified file.
 
-  ## Options
+  ### Options
 
   | Kwarg           | Type     | Description                               | Default                         |
   |-----------------|----------|-------------------------------------------|---------------------------------|

  |`:envvar` |Environment variable that can override the config value and system property (before parsing) |
  |`:source` |Source or container (of reference type, e.g. atom/agent/promise etc.) of key/value pairs     |

  ## Lookup function

  ```
  (fn [store key validator description value-parser default-value? default-value not-found-handler])->value

(defn realize-config
  "Realize config by applying variable substitution, if any.

  ### Options

  | Kwarg          | Type   | Description                 | Default                 |
  |----------------|--------|-----------------------------|-------------------------|
